Sawmill-dog.



.No. 887,132. PATENTED NOV. 27, 1906. G. S. SERGE'ANT. SAWMILL DOG.

APPLIOATION FILED JUNE 8, 1906.

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G. s. SERGE'ANT. SAWMILL DOG.

APPLICATION FILED JUNE 8,-1906.

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E ANT By M ATTORNEYS GEORGE S. SERGEANT, OF GREENSBORO, NORTH CAROLINA.

SAWMILL-DOG.

Specification of Letters Patent.

Patented Nov. 27, 1906.

Application filed June 8, 1906. Serial No. 320,729.

To all whom it may concern.-

Be it known that I, GEORGE S. SERGEANT, a citizen of the United States,and a resident of Greensboro, in the county of Guilford and State ofNorth Carolina, have made certain new and useful Improvements inSawmill- Dogs, of which the following is a specification.

My invention is an improvement in sawmill-dogs; and it consists incertain novel constructions and combinations of parts, as will behereinafter described and claimed.

In the drawings, Figure 1 is a perspective view of my invention inconnection with a sawmill-carriage and the supporting-rails therefor.Fig. 2 is a top plan view of the improved dogging device. Fig. 3 is adetail cross-section drawn through the guide-frame for the lower dog.Fig. 4 is a detail perspective view of the guideframe. Fig. 5 is adetail perspective view of the detent for the lever which operates thelower dog, and Fig. 6 is a detail side view of the upper dog and theparts immediately connected therewith.

In carrying out my invention I provide a lower dog, means for forcingsaid dog upwardly into the under side of the log and for forciblyreleasing it from engagement with the log, and arrange the said meansand devices for convenient operation, as will be more fully described.

In the accompanying drawings the carriage, with its log-beam A and kneesB, may be of any suitable construction. On the logbearn I mount theguide-frame for the upright rod O of the lower dog C, said dog having atits lower end a lateral arm C supplied at its outer end with the tooth Oto bite into the under side of the log.

The guide-frame D is mounted on a baseplate E and is in semitubularform, (see Fig. 4,) having the vertical channel D, in which the rod Cmoves longitudinally and turns in the operation of the invention andprovided at the upper and lower ends of said channel D with bearings Dand D in which the rod C is held, so that it may move longitudinally andturn in the manner presently described. The base-plate E has theopenings E and E on the opposite sides of the upright guideframe, andeither of these openings may be utilized to receive the upright rod Ffor guiding the upper dog, so that the said dog may be placed to theright or left of the lower dog, as may be desired in the use of theinvention.

The rod F may, extend through the plate E and thence through the beam Aand be secured by a nut F at its lower end, and a bolt G may be arrangedin the opening at the opposite side of the upright D from the rod F toaid in securing the plate E firmly to the log-beam A.

At the upper end of the upright portion D of the guide-frame I providethe upright curved portion D notched in its upper edge at d and d toform a rack, and along its outer side with a lateral curved flange Dwhich forms a bearing for the fulcrum-hook presently described, and atthe ends of the rack D" lugs D project upwardly and form stops forlimiting the swinging movement of the lever which operates the lowerdog, as presently described.

The rod C of the lower dog is movable vertically in the bearings D D andmaybe turned therein, and this rod C is provided with avertically-elongated slot C, in which projects one end of the lever G,which fulcrums upon the upper edge of the rack D in raising the dog O,as will be understood from Fig. 3 of the drawings, and also fulcrums, bymeans of its pivoted hook G, beneath the lateral'flange D of theguide-frame in forcibly depressing the lower dog for the purpose ofreleasing it from engagement with the log.

The notches d and (1 may be utilized for locking the lever G in positionto hold the dog O in any desired position beneath the log, and

when the lever G is turned against either of the lugs the tooth O of thelower dog will be adjusted clear of the log and will be retained in suchposition, as will be understood by those skilled in the art. For lockingthe dog G when operated by the lever G into engagement with the latter Iprovide the detent H, having at one end a sleeve H, fitting loosely uponthe upright rod C of the dog C and forked at its other end at H to bearupon the lever G, the sleeve H canting into a biting engagement with therod 0 when a lifting strain is exerted against the forked end of thedetentbracket H, as will be readily understood. By this construction asthe handle end of the lever G is depressed the detent will follow itdown and will lock it in any suitable position to which it may beadjusted.

A cross-pin G is passed through the lever G in front of the rod 0 andprevents the accidental displacement of the lever. It will be understoodfrom the foregoing that the lever G fulcrums upon the upright flange ofthe guide-frame in raising the rod C to cause the dog to bite into thelog and that on the reverse movement when it is desired to release thedog the handle end of the lever G may be slightly depressed to releasethe detent, which may then be raised by hand, and the lever may beraised at its handle end, fulcruming on the hook G engaging belowthelateral flange D in depressing the lower dog to release the same fromits biting engagement with the log.

It is desirable to employ an upper dog in connection with my improvedlower dog, and in the constructionshown the upper dog comprisesa'carrier I, movable up and down on the rod F and having a horizontalopening I in which the horizontal bar J may be moved longitudinally toany desired position and may be secured by a clamping-screw J. The dog Kis pivoted at K at its inner end to the horizontal bar J and is providednear its outer or toothed end K with a pin K which may be engaged by thelever L, pivoted at L to the horizontal bar J and having its upper orhandle arm L arranged to be operated to forcibly press the tooth K intothe upper side of the log,

I claim 1, The combination substantially as her-e in described, of theguide-frame having a baseplate, an upright portion channeled in itsinner face and provided at the upper and lower ends thereof withbearings and in rear of the upper bearings with an upright rack toothedin its upper edge, and in rear of said upright rack with a lateralflange, a lower dog movable longitudinally and adapted to be turned inthe bearings of the guide-frame and having a slot for the passage of anoperating-lever, an operating-lever projecting at oneend through a slotin the dog-rod, and bearing upon the upright rack of the guide-frame andadapted to engage the notches therein, and provided with a dependinghook arranged to bear beneath the horizontal flange of the guide-frameand form a fulcrum for the said lever in forcibly depressing the lowerdog, and a detent sliding upon the upright rod of the dog abovethe-operatingdevcr and having means for engagement with said lever forsecuring the same when operated to force the lower dog into a log,substantially as and for the purposes set forth.

2. The combination in a sawmill-dog, of a lower dog having an uprightguide-rod, a guide-frame having bearings in which said rod may be movedlongitudinally and turned, and also provided with an upright curved rackin rear of said bearings, and provided with notches, andanoperating-lever to engage with said rod and bearing upon the up-' 4.The combination in a sawmill-dog, with the lower dog having an uprightrod, and a guide-frame in which said rod may be moved longitudinally andturned, of a lever fulcruming loosely upon the guide-frame whereby itmay be 0 erated to force the dog into engagement wit 1 the log, and ahook pivoted to the lever and engaging with the guide frame whereby toform a fulcrum for the lever in forcibly depressing the lever-dog torelease the same from engagement with the log, sub stantially as setforth.

5. The combination in a sawmill-dog, with the lower dog having anupright rod, of a guide-frame in which said rod may be movedlongitudinally and turned, said guide-frame having a curved portionforming a fulcrum for an operating-lever, and a horizontal flangeforming a bearing for a fulcrum-hook, and an operating-lever fulcrumingon the guideframe and engaged with the upright rod of the dog, and ahook pivoted to the operatinglever and engaging beneath the horizontalflange of the guide-frame, substantially as set forth.

.6. The combination in a sawmill-dog, with the lower dog having anupright rod, of a guide-frame having bearings in which said rod may beturned and moved longitudinally and provided in rear of said bearingswith a curved upright portion forming a fulcrum for theoperating-lever,and inrear of said portion with a lateral flange forming a bearing for afulcrum-hook, and an operating-lever en= gaged with the upright rodofthe lower dog and fulcruming upon the upright portion of the guide-frameand having a pivoted dog to bear beneath the lateral flange of theguide.- fra'me, substantially as and for the purposes set forth.

GEORGE S, ,SERGEANT.

Witnesses;

W. E. ALLEN, J. FRY.

